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Hunter, L., & Houpt, K. A. (1989). Bedding material preferences of ponies. J Anim Sci, 67(8), 1986–1991.
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Walker, S. (1989). An introduction to animal cognition : By . Hillsdale, New Jersey: Lawrence Erlbaum (1988). Pp. viii + 328. Price [pound sign]8.95 paperback. Anim. Behav., 37(Part 3), 521–522.
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